const digitsRE = /(\d{3})(?=\d)/g

export function factPrice(value, discount) {
  value = parseFloat(value)
  discount = parseFloat(discount)
  if (!discount) return value
  return value * discount
}

export function currency(value, currency, decimals) {
  value = parseFloat(value)
  if (!isFinite(value) || (!value && value !== 0)) return ''
  currency = currency != null ? currency : '￥'
  decimals = decimals != null ? decimals : 2
  var stringified = Math.abs(value).toFixed(decimals)
  var _int = decimals ? stringified.slice(0, -1 - decimals) : stringified
  var i = _int.length % 3
  var head = i > 0 ? _int.slice(0, i) + (_int.length > 3 ? ',' : '') : ''
  var _float = decimals ? stringified.slice(-1 - decimals) : ''
  var sign = value < 0 ? '-' : ''
  return (
    sign + currency + head + _int.slice(i).replace(digitsRE, '$1,') + _float
  )
}

export function formatTime(value) {
  return value
    .toLocaleString()
    .replace(/T/g, ' ')
    .replace(/\.[\d]{3}Z/, '')
}
